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value.go
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value.go
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package queryrange
import (
"github.com/pkg/errors"
"github.com/prometheus/prometheus/model/labels"
"github.com/prometheus/prometheus/promql"
"github.com/cortexproject/cortex/pkg/cortexpb"
"github.com/cortexproject/cortex/pkg/querier/tripperware"
)
// FromResult transforms a promql query result into a samplestream
func FromResult(res *promql.Result) ([]tripperware.SampleStream, error) {
if res.Err != nil {
// The error could be wrapped by the PromQL engine. We get the error's cause in order to
// correctly parse the error in parent callers (eg. gRPC response status code extraction).
return nil, errors.Cause(res.Err)
}
switch v := res.Value.(type) {
case promql.Scalar:
return []tripperware.SampleStream{
{
Samples: []cortexpb.Sample{
{
Value: v.V,
TimestampMs: v.T,
},
},
},
}, nil
case promql.Vector:
res := make([]tripperware.SampleStream, 0, len(v))
for _, sample := range v {
res = append(res, tripperware.SampleStream{
Labels: mapLabels(sample.Metric),
Samples: mapPoints(promql.FPoint{
T: sample.T,
F: sample.F,
}),
})
}
return res, nil
case promql.Matrix:
res := make([]tripperware.SampleStream, 0, len(v))
for _, series := range v {
res = append(res, tripperware.SampleStream{
Labels: mapLabels(series.Metric),
Samples: mapPoints(series.Floats...),
})
}
return res, nil
}
return nil, errors.Errorf("Unexpected value type: [%s]", res.Value.Type())
}
func mapLabels(ls labels.Labels) []cortexpb.LabelAdapter {
result := make([]cortexpb.LabelAdapter, 0, len(ls))
for _, l := range ls {
result = append(result, cortexpb.LabelAdapter(l))
}
return result
}
func mapPoints(pts ...promql.FPoint) []cortexpb.Sample {
result := make([]cortexpb.Sample, 0, len(pts))
for _, pt := range pts {
result = append(result, cortexpb.Sample{
Value: pt.F,
TimestampMs: pt.T,
})
}
return result
}